20ML Screw Top Headspace Vial for Lab manufacturing by Quzhou Lab Technology Co., Ltd.; Product details of China 20ML Screw Top Headspace Vial for Lab. Description HPLC Vials &gc vials, caps and septa Screw Top Headspace Vial are designed to work flawlessly the vials your autosampler`s gripping and injection mechanisms – eliminating breakage and leaks that can cause unnecessary downtime